The average custodial salary at Tomball Isd was $21,500 , which is 18 percent lower than the average salary for this job in Texas, and 35 percent lower than the national average for this job . Custodial salaries at Tomball Isd typically range from $18,834 to $22,685 (25th to 75th percentile). The highest reported custodial salary was $43,738. There are 133 employees at Tomball Isd with the job title custodial.